Accuracy vs Precision

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Matlynn Giles 2E
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Accuracy vs Precision

Postby Matlynn Giles 2E » Mon Oct 05, 2020 10:44 am

I found it really helpful the example Dr. Lavelle gave for Accuracy vs Precision. For me, it helped to think "Accuracy is how exact you are" and "Precision is how much of a pattern there is." Hope this helps!

Shrinidhy Srinivas 3L
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Re: Accuracy vs Precision

Postby Shrinidhy Srinivas 3L » Mon Oct 05, 2020 10:45 am

This is super helpful! Thank you!

Yasmina Zaarour 1G
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Re: Accuracy vs Precision

Postby Yasmina Zaarour 1G » Mon Oct 05, 2020 10:47 am

This does help! However, with that in mind, why are measuring tools and significant figures labelled with a certain "precision" if precision is how close multiple measurements are to each other?

Lucy_Balish_3G
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Re: Accuracy vs Precision

Postby Lucy_Balish_3G » Mon Oct 05, 2020 10:48 am

Yes, I agree. That was super helpful!! For me the way I try to remember is "precision means consistent" and "accuracy means correct".

Shrinidhy Srinivas 3L
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Re: Accuracy vs Precision

Postby Shrinidhy Srinivas 3L » Mon Oct 05, 2020 10:49 am

Measuring tools usually have the aspect of precision because it represents how close to the actual answer the measurement will be. It shows how close together the results will be, which makes sense according to the definition of precision.

John Calonia 1D
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Re: Accuracy vs Precision

Postby John Calonia 1D » Mon Oct 05, 2020 10:49 am

I believe they are labelled that way to show how reproducible the results they come up with are. I think of precision as reproducibility or how close together the results are from multiple tests. A measuring instrument can be completely uncalibrated, but if the results are all close together, you still know its a precise measurement.

Kiran Singh 3A
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Re: Accuracy vs Precision

Postby Kiran Singh 3A » Mon Oct 05, 2020 10:52 am

I agree! I found the target example helpful too, as accuracy would be hitting the small red circle in the middle and precision would be consistently hitting one place on the target.

Megan Hulsy 1A
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Re: Accuracy vs Precision

Postby Megan Hulsy 1A » Mon Oct 05, 2020 10:57 am

I agree with this! I like how you portray precision as pattern and accuracy as exact, since this was somewhat difficult for me to understand. The target example was helpful for me as well.

Keeryth Sandhu 1H
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Re: Accuracy vs Precision

Postby Keeryth Sandhu 1H » Mon Oct 05, 2020 12:14 pm

I agree! The target example was really helpful in explaining that precision is more about consistency where accuracy is about correctness.

Leyna Tran 2D
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Re: Accuracy vs Precision

Postby Leyna Tran 2D » Mon Oct 05, 2020 12:21 pm

Thank you! This is helpful to me in remembering the differences between the two! Precision, Pattern, Persistency- 3 P's. The target example also really helped me to be able to visualize the differences. The goal is hit the bullseye, so the darts that hit it are accurate. As the previous post mentioned, it is about "correctness."

emmaferry2D
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Re: Accuracy vs Precision

Postby emmaferry2D » Mon Oct 05, 2020 12:25 pm

The bullseye metaphor that Lavelle used in the pre recorded lecture helped clarify the concept, so if y'all are having a hard time grasping that I suggest watching that part again! Basically he explains that accuracy is like hitting the dart board close to the bullseye even if there are not consistent shots. He describes precision as hitting the dart board in the same spot consistently even if it is not near the bullseye.

Evelyn Silva 3J
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Re: Accuracy vs Precision

Postby Evelyn Silva 3J » Mon Oct 05, 2020 1:14 pm

Yes I agree! When he showed us the target pictures in the lecture it helped me visualize what he was trying to explain and understand the difference between the two.

BKoh_2E
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Re: Accuracy vs Precision

Postby BKoh_2E » Mon Oct 05, 2020 4:32 pm

The analogies they have given are really good. Accuracy is how close the measurement is to the correct value, while precision is how close a group of measurement are to each other.

Jiapeng Han 1C
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Re: Accuracy vs Precision

Postby Jiapeng Han 1C » Tue Oct 06, 2020 6:25 am

Accuracy is how close you are to the real/true value. Precision is how close your experimental data is to each other. For example, let's say you want to measure the length of your pencil which is 15cm long and you measure 3 times. If you get 15.1cm, 15.0cm, 14.9cm, then you are both accurate and precise. However, if you get 14.1cm, 13.9cm, 14.0cm, then you are only precise because the data is close to each other.

Bailey Giovanoli 1L
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Re: Accuracy vs Precision

Postby Bailey Giovanoli 1L » Tue Oct 06, 2020 9:25 am

I’ve always struggled with the difference between the two. I didn’t catch this in the lecture. Thank you for posting this, I’ll surely remember this from now on.

Becca Nelson 3F
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Re: Accuracy vs Precision

Postby Becca Nelson 3F » Tue Oct 06, 2020 11:29 am

There are major implications of accuracy and precision in the lab. Precision is one of the main reasons we have significant figures. Our resulting value needs to reflect the instrument with the most error that we used. We want other scientists to see how precise our data is which is a reflection of how precise our lab equipment is. It is incredible how such a fundamental idea is used in all chemistry!

Nhu Pham-Dis3G
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Re: Accuracy vs Precision

Postby Nhu Pham-Dis3G » Tue Oct 06, 2020 6:18 pm

With the definitions of accuracy and precision in mind, in what cases or scenarios would it be more useful to determine the accuracy/ precision? Is one more beneficial than the other in general, or does it solely depend on the situation?

Neel Bonthala 2G
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Re: Accuracy vs Precision

Postby Neel Bonthala 2G » Tue Oct 06, 2020 6:39 pm

Nhu Pham-Dis3G wrote:With the definitions of accuracy and precision in mind, in what cases or scenarios would it be more useful to determine the accuracy/ precision? Is one more beneficial than the other in general, or does it solely depend on the situation?


I think accuracy more often than not trumps precision when it comes to obtaining correct data. However, in the context of an experiment, I'd say that precision is incredibly important, because variations in data from trial to trial can discredit the validity of an experiment. Ultimately, I think accuracy is more beneficial, although I think it should work with precision to obtain the best data possible :)

Charmaine Ng 2D
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Re: Accuracy vs Precision

Postby Charmaine Ng 2D » Tue Oct 06, 2020 6:46 pm

Nhu Pham-Dis3G wrote:With the definitions of accuracy and precision in mind, in what cases or scenarios would it be more useful to determine the accuracy/ precision? Is one more beneficial than the other in general, or does it solely depend on the situation?



When conducting experiments, I think that accuracy is perhaps more valuable, since you can still gain a general conclusion or understanding of the experiment. However, mentality-wise, I think that scientists should not approach experiment prioritizing one over the other.The most desirable result would be to aim for both the most accurate and most precise results. Accuracy without precision or precision without accuracy still create flaws within experiments, and so both are important when conducting experiments! :))

jessicasilverstein1F
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Re: Accuracy vs Precision

Postby jessicasilverstein1F » Wed Oct 07, 2020 11:36 am

Another super helpful way to think about it is shown in the bullseye picture that Professor Lavelle elaborated on in his first lecture! Very helpful for visual learners.
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Rich Luong 1D
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Re: Accuracy vs Precision

Postby Rich Luong 1D » Wed Oct 07, 2020 11:42 am

To truly help remember, precision is that the values are very close to one another and accuracy is that the values are very close to the true value of whatever is trying to be found.


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